Revert "feat(vertex): add support for US multi-region endpoint"

This reverts commit 0de0e98.

Author: dtmeadows

packages/vertex-sdk/src/client.ts

@@ -86,21 +86,12 @@ export class AnthropicVertex extends BaseAnthropic {
       );
     }
 
-    if (!baseURL) {
-      switch (region) {
-        case 'global':
-          baseURL = 'https://aiplatform.googleapis.com/v1';
-          break;
-        case 'us':
-          baseURL = 'https://aiplatform.us.rep.googleapis.com/v1';
-          break;
-        default:
-          baseURL = `https://${region}-aiplatform.googleapis.com/v1`;
-      }
-    }
-
     super({
-      baseURL,
+      baseURL:
+        baseURL ||
+        (region === 'global' ?
+          'https://aiplatform.googleapis.com/v1'
+        : `https://${region}-aiplatform.googleapis.com/v1`),
       ...opts,
     });
 

packages/vertex-sdk/tests/client.test.ts

@@ -25,15 +25,6 @@ describe('AnthropicVertex', () => {
       expect(client.baseURL).toBe('https://aiplatform.googleapis.com/v1');
     });
 
-    test('us region uses correct base URL', () => {
-      const client = new AnthropicVertex({
-        region: 'us',
-        projectId: 'test-project',
-        accessToken: 'fake-token',
-      });
-      expect(client.baseURL).toBe('https://aiplatform.us.rep.googleapis.com/v1');
-    });
-
     test.each(['us-central1', 'europe-west1', 'asia-southeast1'])(
       'regional endpoint %s uses correct base URL format',
       (region) => {